Sorry about that. The Godot port seems really unreliable. I think I'm going back to Unity. No one had any problems running with those builds. Thanks for the feedback, it's really useful.
Dude! You wrote a version of Chuckie Egg! That was one of my favourite Beeb games back in the day. This is my attempt at getting a second game published (self published this time). First one was on the BBC micro. Source code: https://github.com/dr-grim/vertigo